How To Fix Jeep Check Engine Light Issues

If you drive a Jeep vehicle and you see a check engine light, we have you covered in this article. A check engine light is a warning signal, that indicates the ECU has detected a problem in your vehicle. A jeep check engine light can range from a loose gas cap to a damaged catalytic converter.

A blinking check engine light indicates a more serious problem and should be checked by your mechanic right away. A blinking check engine light should be scanned to derive the appropriate Jeep check engine light codes that would help you fix this issue.

Here in this article, we would briefly discuss how to fix the Jeep check engine light.

Jeep Check Engine Light dashboard

How To Fix Jeep Check Engine Light

Whether you drive a Jeep Wrangler, Compass, Renegade, Gladiator, or grand Cherokee. We would now list the various ways that you can follow to help you fix your Jeep check engine light when it comes up on your dashboard.

Replace Gas Cap

The most common reason your Jeep check engine light comes on is a loose, broken, or missing gas cap. A loose gas would lead to fuel evaporation which may affect your vehicle emission system or engine. Make sure you tighten a loose gas cap or replace a damaged gas cap as required.

Replace Spark Plug

The function of the spark plug is to create a spark that is enough to start the car engine. Overheating and carbon build-up decrease the lifespan of a spark plug and this can trigger the check engine light to come on your dashboard, A damaged spark plug often leads to your car engine taking too long to respond, a decreased acceleration, and engine misfire. Therefore ensure to check and replace a damaged spark plug.

Faulty Ignition Coils

The Ignition Coil is part of your vehicle ignition system. It converts the voltage from the car battery to the required amount of volts enough to trigger the spark plug which ignites the engine air-fuel mixture.

The check engine light will turn on, whenever your car detects a faulty ignition system, You can use a multi meter to test the ignition coils of your car or use a spark tester to check the ignition coil.

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Jeep Check Engine Light Dashboard

Replace Oxygen Sensor

A faulty oxygen sensor is one the most common reason your Jeep check engine light comes on your dashboard. The oxygen sensor measures the concentration of oxygen in the exhaust gas and it sends this information to the electronic control unit The oxygen sensor also adjusts the air-fuel ratio when required and it determines the performance of the catalytic converters.

The oxygen sensor often gets damaged due to its exposure to the hot air coming from the exhaust gas. A faulty oxygen sensor would trigger the check engine light to turn on, as it would fail to send information to the electronic control system and this could lead to increased fuel consumption, emission failures, rough engine sounds, overheating engine, and poor gas mileage.

Replace Mass Airflow Sensors

The mass airflow sensor measures the quantity of air that enters the engine cylinder. It is usually installed between the air filter and the intake manifold of your engine. A faulty airflow sensor will increase emissions and can cause the car to stall out. Ensure you replace the air filter and a damaged airflow sensor,

A faulty mass airflow sensor can lead to your car engine running on too much fuel and less air or too much air and less fuel. Which will trigger the check engine light to turn on due to your Jeep car engine failing to operate on a balanced air-fuel ratio.

Replace Catalytic Converter

A catalytic converter is part of the engine exhaust system and serves as an exhaust emission control device. Its function is to convert toxic gases and pollutants coming from your engine into less-toxic pollutants.

The catalytic converter of your vehicle can get clogged with material, a failed or clogged catalytic converter would affect fuel economy and the performance of your vehicle.

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Jeep Wrangler Check Engine Light Gas Cap

A loose, broken, or missing gas cap is the most common reason your Jeep check engine light comes on. A loose gas cap leads to the evaporation of fuel which will affect your vehicle’s emission system or engine.  Ensure the fuel seal is tightened and if it is broken it should be replaced.

Jeep Check Engine Light Code

When your check engine light turns on, this is a simple sign that you should check your car engine. You can do that by using a scanner that diagnoses error codes.

 There are lots of codes that your check engine light can represent. The engine light comes on when the sensors send information to the ECU about a problem. The diagnostic scanner helps you to interact with the electronic computer unit (ECU) in your vehicle by giving you a clue of what is wrong with your vehicle.

Jeep check engine light oil change

Jeep Check Engine Light Oil Change

Most modern vehicles are equipped with an oil pressure switch.  Jeep vehicles have an oil pressure gauge on their dashboard that illuminates your dashboard at low oil pressure.

You can have a low oil pressure due to low oil level, high/low viscosity, faulty oil switch, faulty oil pump, clogged oil filter, or oil leakages.

Whenever the low oil pressure warning light comes on, ensure you change your engine oil. You can also check engine oil levels with the oil gauge rod in your engine. The oil gauge rod is marked with calibrations that allow you to determine the oil level in your engine.

If the engine oil level is normal and your engine runs smoothly, then the issue is likely from a faulty oil pressure switch.

Jeep Wrangler Check Engine Light Reset

You can reset your Toyota check engine light by using an OBD-II scanner. Follow these steps to reset your Toyota check engine light:

  • Locate the OBD-II diagnostic connector port in your Jeep vehicle. You can locate the connector close to the steering wheels under the driver-side dashboard.
  • Firmly connect the OBD 2 dongle with the connector port.
  • Turn the ignition key to the on position but ensure you don’t start the engine of your Jeep vehicle. The led light on the OBD II dongle should now begin to blink.
  • Launch the diagnostic software then choose between the Bluetooth, WiFi, or USB connection options.
  • Press the “read” button on the OBD II scanner to access the check engine light codes.
  • These codes will be a series of letters and numbers and make all the necessary repairs to your Jeep vehicle.
  • Navigate to diagnostic trouble codes and Freezer frame to get more detailed information, this may defer depending on the software or diagnostic tool.
  • Depending on your OBD II software device. Click on clear the diagnostic trouble codes button in the trouble codes view or click the reset trouble codes and MIL button.
  • The reset command will be sent to your vehicle and your Jeep check engine light will be cleared.

You can also manually reset your Toyota check engine light by simply disconnecting the negative battery cable. Follow these steps on Toyota engine reset:

  • First, turn off the ignition.
  • Then differentiate between the negative and positive terminals of your car battery. The negative terminal has a negative (–) sign and a black cap. While the positive terminal has a positive (+) sign and a red cap.
  • Now loosen the nut on the negative terminal with a wrench and pull the negative connector away from the battery.
  • Leave it out for 30 to 60 seconds.
  • Finally, reconnect and tighten the negative terminal using a wrench.
  • Your Jeep check engine light should be finally reset.

Can I Drive My Jeep With Check Engine Light On?

Ensure you don’t drive your Jeep vehicle with the check engine light. The check engine light is a warning signal and you should have it fixed. To avoid escalating this issue into a more severe issue in your vehicle.

Jeep dashboard light

What Is The Most Common Reason For Check Engine Light?

The reasons for a check engine light in your Jeep vehicle include:

  • Loose, broken, or missing gas cap.
  • Fuel and air metering systems problems.
  • Transmission issues.
  • Bad spark Plugs.
  • Computer output circuit issues.
  • Emissions control issues.
  • Faulty ignition system.
  • Oxygen Sensor.
  • Mass airflow Sensor.

Is it OK to drive car with a check engine light on

Avoid driving your vehicle with the check engine light on, until you have this issue fixed. If you ignore the check engine light, it can lead to more severe damage, which would be costly to fix.

Will Jeep Check Engine Light Reset Itself?

Your Jeep vehicle may reset itself if the issue has been fixed. In some cases, the check engine light might not reset itself and would have to be done with a diagnostic scanner or by removing the battery.

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